Thaum Mitosis, DNA tau rov ua dua thaum the S theem (Synthesis theem) ntawm Interphase. Interphase yog qhov pib lub neej txhua hnub ntawm lub xov tooj ntawm tes. Cells siv feem ntau ntawm lawv lub neej hauv Interphase ua ntej Mitosis tshwm sim (M theem).
Thaum lub sijhawm twg DNA rov ua dua tshwm sim?
S theem yog lub sijhawm uas DNA rov tshwm sim.
Lub sijhawm twg yuav DNA rov ua dua tshiab?
DNA replication tshwm sim thaum S theem thiab ua rau ob tug muam chromatids rau txhua tus thawj chromosome. Kev luam ntawm chromosomes tshwm sim thaum twg ntawm cov theem hauv qab no ntawm lub voj voog ntawm tes? Chromosomes yuav tsum tau rov ua dua ua ntej mitosis tuaj yeem tshwm sim; Qhov kev theej no tshwm sim thaum lub sijhawm S.
Qhov xwm txheej twg tshwm sim thaum lub sijhawm DNA rov ua dua?
DNA rov ua li cas? Replication tshwm sim nyob rau hauv peb kauj ruam tseem ceeb: qhib ntawm ob lub helix thiab kev sib cais ntawm DNA strands, priming ntawm template strand, thiab kev sib dhos ntawm cov DNA tshiab. Thaum sib cais, ob txoj hlua ntawm DNA ob lub helix uncoil ntawm qhov chaw tshwj xeeb hu ua keeb kwm.
Thaum twg DNA rov ua dua tshwm sim thiab vim li cas?
S theem ntawm lub voj voog ntawm tes tshwm sim thaum lub sijhawm sib cuam tshuam, ua ntej mitosis lossis meiosis, thiab yog lub luag haujlwm rau kev sib txuas lossis rov ua dua ntawm DNA. Nyob rau hauv no txoj kev, genetic khoom ntawm ib tug cell yogob npaug ua ntej nws nkag mus rau mitosis lossis meiosis, tso cai kom muaj DNA txaus los faib rau hauv cov menyuam ntxhais.
